import Vue from 'vue'
import Router from 'vue-router'
import Login from './components/Login'
import Home from './components/Home'
import Welcome from './components/Welcome'
import Users from './components/user/Users'

Vue.use(Router)

const router = new Router({
  routes: [{
      path: '/',
      redirect: '/login'
    },
    {
      path: '/login',
      component: Login
    },
    {
      path: '/home',
      component: Home,
      redirect: '/welcome',
      children: [{
          path: '/welcome',
          component: Welcome
        },
        {
          path: '/users',
          component: Users
        }
      ]
    },

  ]
})
//挂载路由导航守卫
router.beforeEach((to, from, next) => {
  //to 将要访问的路径，from 代表从哪个路径跳转而来，
  //next是函数，表示放行，next()放行,next('./login')强制跳转
  //如果用户访问的登录页，直接放行
  if (to.path === '/login') return next()
  //从sessionStorage中获取token
  const tokenStar = window.sessionStorage.getItem('token')
  //如果没有token强制跳转到登录页，有就放行
  if (!tokenStar) return next('/login')
  next()
})

export default router